Cone speaker



Oct. 19 1926.

c. A. BRIGHAM ET AL CONE SPEAKER 1925 2 Sheets-Sheet L Ori inal Filed Oct. 2

F IG INVENTOR. .DAY/D HMASS 4-o CXC/L A. BlQ/Gl/HM ATTORNEY.

Oct. 19 1926. 1,604,017

c. A. BRLGHAM ET AL coma SPEAKER Original il d o t- 2, 1925 ZSheets-Sheet z ZNVENTORRS DAY/D H M085 AND 076/1. A fiK/GHAM 616 flud,

ATTORNEY Patented Oct 19, 1926.

PATENT OFFICE- CYRIL A. ERIG AM, or EAST ORANGE, AND DAVID H. MOSS, or. NEW RK, NEW JER- SEY, ASSIGNORS 'ro BRANDES LABORATO IES, Inc, or NEWARK, NEW JERSEY, A

CORPORATION 01 NEW JERSEY.

CONE SPEAKER.

Application filed October 2,1925 Serial No. 60,128. Renewed September 17, 1926.

Our invention relates broadly to electromagnetic sound reproducers and more -particularly to a cone speaker for the reproduction of radio broadcast news, concerts, mu-

sic and other entertainment.

One of the objects of our invention is to provide a cone speakerfor radio broadcast reproduction which is practical in construction. and eflicient in its'reproduction of radio broadcast.

' Another object of our invention is to pro-.

2 netic driver and an ellipticalcone shaped diaphragm within the cabinet wherein means are provided for eliminating undue damping of the diaphragmwhile permitting efficient operation ofthe cone shaped diaphragm in confined air.

Other andffurther ob 'ects of our invention will become apparent as the following specification progresses, by reference to the accompanying drawings. in which Figure 1 is'a side elevation of the parts of the cone speaker where one side of the cabinet has been broken away to show the operating parts therein; Fig. 2 is a rear view of. the cone speaker with the back of the cone speaker removed to showthe arrangement of the operating partsand the support for the cone diaphragm therein.

Heretofore" 'n the art it has been proposed and wherein the parts are positioned with-f in confined air for introducing a" desired degree ofdamping of the diaphragm, while 5 means are provided for preventing undue damping of the diaphragm. I

Referring. more particularly to the drawings, the elliptical conical, shaped diaphragm has been represented by reference to employ large size cone diaphragms rigp character 1 as mounted within a vertical plate 2 which is secured to. a base memher 3 by means of bracket members 4. The elliptical cone shaped diaphragm 1 is flexibly connected at its periphery to a resilient elliptical shaped strip 5 which in turn is connected to plate 2, thus permitting the elliptical cone shaped diaphragm 1 to float within an elliptical aperture 6 in the vertical plate 2. An electromagnetic driver of push-pull construction has been represented as contained within a casing 7 and supported ;upon a vertically extending casting 8.

The electromagnetic driver 7 is positively spaced from the plate 2 by means of strip 9 secured at the upper extremity 10 of the plate 2 and to a point 11 on the casing 7..

The base 3. the electromagnetic driver 7 and the conical shaped diaphragm 1, are enclosedby a housing 12 having a front wall portion 14, with a suitable aperture 15 therein through whichthe reproduced sound may be radiated, and a rear wall portion 16. The vertical plate 2 is spaced from the front plate 14 by a distance represented at 17 and the plate 2 does'not extend into abutment with the housing 12, but is provided with a positive gap'18 around the sides thereof. The top portion of theplate 2 is cutaway as representedat 19 20, 21 and 22 to provide a suflicient air space to prevent undue damping of the diaphragm 1. It will. be observed that the rear wall 16 serves as a baffle plate against which the diaphragm l operates in confined air and it is for the purpose of relieving undue damping of the diaphragm that we provide the cut away portions 19, 20, 21 and 22. The conical shaped diahragmis driven from the apex thereof to a link 23 which connects with the armature of the electromagnetic driver within thecasing 7 The variable currents from the output of the amplification system of a radio receiver will lead through conductors 24 which connect with the electromagnetic windings of the driver.

' shapeddiaphragm is'vibrated in accordance with the movement of the cone diaphragm 1 and the sound is directed outwardly from the concave side of the diaphragm through the aperture 15 at greatly increased volume. We have found ,the elliptical cone diaphragm especially suitable for quality reproduction of broadcast entertainment.

We have determined that the arrangement of parts set forth herein is very practical and desirable in operation, and while we have described a preferred embodiment of' our invention it will be understood that modifications may be made and that no limitations upon the invention are intended other than those imposed by the scope of the appended claims. v

What we claim and desire to secure by Letters Patent-of the United States is as follows: I 4

1. A cone speaker comprising in combination a base member, a vertical plate secured to said base member, an elliptical aperture in said plate, a supportingnnember, an electromagnetic driver carried thereby, an elliptical cone diaphragm located within said elli tical aperture, a connection between sai diaphragm and said electromagnetic driver for imparting sound vibrations to said diaphragm and a casing enclosing one side-of said elliptical conediaphragm and enclosing said electromagnetic driver for am lifying the sound waves generated by sai elliptical cone diaphragm.

2., A cone speaker comprising in combination a 'basemembena vertical plate member carried by said base member adjacent one end thereof, a cone diaphragm having its floating edge terminating in the plane of said late member, a support mounted on said ase member adjacent the opposite end thereof, an electromagnetic driver mounted on said support, a connection be tween said driver and said cone diaphragm for impartingsound vibrations thereto and a casing mounted on said. base member and enclosing said vertical plate member and said support and serving to amplify the sound waves generated by said cone diaphragm.

3. A cone speaker comprising in combination a base member, a vertical member carried by said base member, a cone diaphragm having its floating edge terminating in the plane of said member, an electro-,

magnetic driver mounted in spaced relation to said diaphragm and arranged to vibrate said diaphragm, and a housing substantially enclosing said diaphragm and electromagnetic driver whereby saiddiaphragm operates in confined air for amplifying'the sound waves generated by said cone diaphragm.

4. A cone speaker comprismg in combination a base member, a vertical member carried by said base member adjacent one end thereof, a conediaphragm having its floating edge terminating in the plane of said member, a support mounted on said base member adjacent the opposite end thereof, an electromagnetic driver mounted on said support, for actuating said cone diaphragm, a housing substantially enclosing said diaphragm and electromagnetic driver, said vertical member being smaller than the interior of said housing for allowin free passage of sound vibrations aroundsaid diaphragm within said housing,-and reducing the damping of said diaphragm.

A cone speaker comprising in combination a base member, a vertical member carried by said base member adjacent one end thereof, a cone diaphragm having its floating edge terminating substantially in the plane of said vertical member, an electromagnetic driver,.a vertical support carried by said base member and carrying said electromagnetic driver on the upper extremity thereof, said supporthavingsuch a height that said electromagnetic driver is located on an axis through the apex of said cone diaphragm and 'a casing enclosing said support and having a contour at one end conformingto the shape of said cone diaphragm for amplifyingthe sound gener-.

ated by said cone diaphragm.

6. A cone speaker comprising in combination a base member, a vertical member carried by said base member adjacent one end thereof, a cone diaphragm having its floating edge terminating in the plane of member being spaced from the front wall of said housing and being smaller in size than the interior thereof whereby said dlaphragin operates substantially in confined air with respect to said housing and rear wall, with the damping reduced by the free passage for sound vibrations between the interior walls of said housing and said vernected with said-electromagnetic driver, a

sound amplifying cabinet having its lower end supported by said base member and havcal plate substantially conforming with the shape of the side walls of said cabinet but having dimensions less than the dimensions of the interior walls of said cabinet, and being spaced from the front wall of said cabinet for providing a free passage from the interior of said cabinet arou'nd said vertical plate, anelliptical conical shaped diaphragm resiliently mounted in said plate with the apex thereof directedtoward the interior of said cabinet and connected with said electromagnetic driver whereby sound vibrations may be imparted to said diaphragm. I

9. A soundreproducer comprising a cone diaphragm of elliptical contour, a flat plate apertured to provide an enclosure for the elliptical peripherial edge of said diaphragm, an electromagnetic driver, a connec t on vbetween sa1d drlver and the apexof said diaphragm on the convex side thereof,

means, for supporting said driver in spaced.

relation to said diaphragm for imparting vibrations tothe apex of said diaphragm and a sound amplifying cabinet substantially enclosing theconvex side of said diaphragm and said electromagnetic driver for directing sound waves outwardly from the concave side of said diaphragm at increased amplitude.

10. A sound reproducer comprising a supporting base member, a front and rear vertical wall member extending from sa1d base member, each of said wall members termi-l nating in a periphery of elliptical contour, a housing extending from one side of said base member conforming with the peripheries of said front and rear wall members and terminating adjacent the other side of said base member, an electromagnetic driver support- .ed by said base member adjacent said rear wall member, an elliptical conical dia-' phragm having its floating edge terminating adjacent said front "wall member and a connection between said driver and said elliptical conical diaphragm for reproducing sound vibrations within said'housing whereby said housing operates to amplify the effect of said reproduced sound vibrations. V

11. A sound reproducer comprising an electromagnet driver including an armature with a link extending "therefrom, a cone shapeddiaphragm connected to said link, and a sound amplifying chamber enclosing said cone shaped diaphragm in substantially confined air and operating to modify the characteristics of the tone frequencies reproduced by said cone shaped diaphragm.

t DAVID H. MOSS.

CYRI L A. BRIGHAM. 

